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Dwarfness can be controlled by treating the plant with

1. cytokinin
2. gibberellic acid
3. auxin
4. antigibberellin

Correct answer: gibberellic acid

Solution

Gibberellic acid promotes cell elongation and stem growth, so it can overcome dwarfness in plants. Dwarf plants often result from low gibberellin activity, and supplying it restores normal elongation.

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